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SYSTEMS PREPARATION QUESTIONS 2008 - 3
 
V. Ryan 2008-2017
 
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The Theme Park owner has commissioned a model clown. The aim is to frighten younger visitors. A motor inside the clown drives the arms up and the arms return to their original position when the motor is off The motor is the output to a 555 timer circuit. The circuit also produces sound as the arms move.
 
 
 
 
There are two types of 555 timer. What is the name of the 555 circuit shown below?
 
CIRCUIT NAME: ______________________________________
 
ANSWER
CIRCUIT NAME:  555 ASTABLE
 
Label the components on the circuit diagram below (A TO G).
 
 
 
ANSWER
 
 
 
 
The relay is causing major problems because an important component is missing. Name the component and draw its symbol in the correct position on the circuit diagram above.
 
COMPONENT NAME: ______________________________
 
ANSWER
 
COMPONENT NAME: DIODE
 
What is the function of the component ?
 
 
 
 
 
ANSWER
 
The diode protects sensitive components such as the transistors from back E.M.F. When a current to a relay is removed the relay can emit current stored in its coils. This can be sent the wrong way round the circuit damaging components. The diode operates like a one way valve preventing this from happening.
 
 
 
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